Department of Radiation Oncology Far Eastern Memorial Hospital New Taipei City, Taiwan Impact of Postoperative Daily Image-Guided Intensity-Modulated Radiotherapy on Overall and Local Progression-Free Survival in Patients with Oral Cavity Cancer Pei-Wei Shueng, MD
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Department of Radiation OncologyFar Eastern Memorial HospitalNew Taipei City, Taiwan
Impact of Postoperative Daily Image-Guided Intensity-Modulated Radiotherapy on Overall and Local Progression-Free Survival in Patients
with Oral Cavity Cancer
Pei-Wei Shueng, MD
Far Eastern Memorial Hospital, Taiwan
Disclosure & Disclaimer • An honorarium is provided by Accuray for this
presentation• The views expressed in this presentation are those of
the presenters and do not necessarily reflect the views or policies of Accuray Incorporated or its subsidiaries. No official endorsement by Accuray Incorporated or any of its subsidiaries of any vendor, products or services contained in this presentation is intended or should be inferred.
Far Eastern Memorial Hospital, Taiwan 3
Introduction Purpose, Methods and Material Results and Discussion Conclusion
Outline
Far Eastern Memorial Hospital, Taiwan Department of Radiation OncologyFar Eastern Memorial Hospital, Taiwan
• Postop IGRT (TomoTherapy® System): better OS, better local PFS, less marginal failure and shorter overall treatment time than postoperative non-image-guided IMRT
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Hsieh CH, et al. BMC Cancer. 2016
Adjuvant TomoTherapy® System better than adjuvant IMRT
HT HT
85%
IMRT IMRT
58%48%
87%
Survival
Far Eastern Memorial Hospital, Taiwan
Selectedseries
No. ofpostop patient
Postop Modality
FU(year) OS DFS LR
PF DMF
Lin . 245 IMRT 5 54% 68% 41% 66%
Hoffmann 18 IMRT 5 77% 72% 78% 80%
EORTC 22931
41(167) CCRT 5 53% 47%
RTOG 9501
50(206) CCRT 5 46% 30%
FEMH(152 pts)
79 IMRT
5
48% 39% 58% 83%
73 HT 87% 74% 85% 80%
Long-term Result
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Far Eastern Memorial Hospital, Taiwan 13
Far Eastern Memorial Hospital, Taiwan
Prognostic factors IMRT HT p value
Resection-margin 49% 58% 0.313
ECE 17% 26% 0.148
PNI 62% 82% 0.006
LVSI 39% 62% 0.003
Two or more positive lymphnodes
22% 30% 0.302
T3,T4 54% 48% 0.768
Adjuvant chemo 85% 89% 0.442
Hsieh CH et al, BMC Cancer. 2016; 16:139
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More high-risk patients in IMRT group ? No!
Far Eastern Memorial Hospital, Taiwan
Cox proportional-hazards analysis5-year OS 5-year LPFS
Prognostic factors Modality 95% CI p value Modality 95%CI
p valueHT IMRT HT IMRT
Resection-margin 84.0% 57.7%0.52 to 0.68 0.008 92.5% 28.6%
0.51 to 0.77 0.006
ECE 76.6% 31.7%0.39 to 0.65 0.007 54.0% 64.1%
0.39 to 0.65 0.942
PNI 79.3% 35.2%0.15 to
0.97 0.005 82.3% 43.9%0.28 to
0.85 0.003
LVSI 77.0% 50.0%0.49 to
0.64 0.012 78.8% 0.0%0.54 to
0.74 0.001
Two or morepositive lymph nodes
74.0% 40.3% 0.41 to 0.61 0.010 77.0% 26.2% 0.29 to
0.85 0.003
T3,4 72.8% 38.7%0.39 to
0.73 0.017 79.5% 39.8%0.25 to
1.02 0.005
Hazard ratio (HR)* 95% CI P value Hazard ratio (HR)* 95% CI P value
ModalityHT vs IMRT 0.32
0.15 to 0. .67 0.002 0.21 0.08 to
0.59 0.003
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Far Eastern Memorial Hospital, Taiwan
IGRTmay overcome the poorprognostic factors thanIMRT potentially. why?
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Far Eastern Memorial Hospital, Taiwan
Better prognosis shorter POTT and OTTRT
OS LPFS
POTT ≤ 13 weeks OTTRT ≤ 8 weeks
Hsieh CH et al, BMC Cancer. 2016; 16:139
Package of overall treatment time (POTT) Overall treatment time of RT (OTTRT)
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Far Eastern Memorial Hospital, Taiwan
Expansion of CTV to PTV margin for HN cancer
Chen AM et al. Head Neck. 2014;36:1766
Volume (4/3 πr3)V outer layer = V core of the orange
Verellen D et al. Nat Rev Cancer ;7:949
Gastrostomy-tube dependence at 1 year 5 mm vs 3 mm
10% vs 3% , p = 0.001 Posttreatment
esophageal stricture 5 mm vs 3 mm
14% vs. 7% , p = 0.01
Small PTV margin difference Make sense
Higher incidence of complications : 5mm vs. 3mm
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Far Eastern Memorial Hospital, Taiwan
More weight loss in adjuvant IMRT GroupIMRT (No. = 79) HT (No. = 73) P value
No. of patients (%)Weight loss
Gr. 1 51 (64.6%) 62 (84.9%)
Gr. 2 27 (34.2%) 11 (15.1%) 0.004
Gr. 3 1 (1.3%) 0
More pts with prolonged Tx time in adjuvant IMRT Group
IMRT HT P value
POTT ≤ 13 weeks 58.0% 83.4% 0.001
OTTRT≤ 8 weeks 68.0% 89.0% 0.002
Hsieh CH et al, BMC Cancer. 2016; 16:139
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Far Eastern Memorial Hospital, Taiwan
VariableIMRT vs HT
Overallsurvival
Pvalue
Local progression-free
survivalP
value
POTT ≤ 13 wks 58.3% vs. 85.0% 0.05 59.1% vs. 85.8% 0.015
OTTRT ≤ 8 wks 58.3% vs. 85.0% 0.05 56.2% vs. 88.0% 0.025
Hsieh CH et al, BMC Cancer. 2016; 16:139
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Far Eastern Memorial Hospital, Taiwan
Pattern of local failure
Local failure rate
IMRT (No. =79 ) HT (No. = 73)
Total local failure 24.0% (n = 19/79) 6.8% (n = 5/73)
In-field failure>95% recurrent volume in CTV
31.6% (n = 6/19) 80.0% (n = 4/5)
Marginal failure20-95% volume in CTV
52.6% (n = 10/19) 0 (n = 0)
Out-of-field failure<20% volume in CTV
15.5% (n = 3/19) 20% (n = 1/5)
Hsieh CH et al, BMC Cancer. 2016; 16:139
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More local failure ( esp. marginal failure) in IMRT group
Far Eastern Memorial Hospital, Taiwan
Marginal Failure is an issue Postop IMRT ± concurrent chemo
Modality Pt. No.
No. of oral cancer (%)
PTV margin
No. of marginal failure /local failure
marginal failure (%)
Bern University Hospital, Switzerland[1]
IMRT 53 100% 3 mm 10/12 83%
Iowa, USA[2] IMRT 49 100% 5 mm 4/9 44%
Toronto, Canada [3] IMRT 180 100% ----- 12/38 32%
UC Davis [4] IMRT 90 48% 3-5 mm 6/17 35%
UC Davis [5] IMRT 52 48% 3-5 mm 4/13 31%
Stanford [6] IMRT 30 100% 3-5 mm 2/11 18%
Kashiwa, Japan [7] IMRT 122 48% 5 mm 5/32 16%
FEMH [8] IMRT 79 100% 5 mm 10/19 53%
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Far Eastern Memorial Hospital, Taiwan
Postop daily IGRT decrease marginal miss Modality Pt.
No. oral
cancer (%)
PTV margin
No. of marginal failure/local failure
marginal failure (%)
UCDavis [9]
IG-IMRT103 31% 5 mm 5/76 7%
264 21% 3 mm 4/76 5%
FEMH[8]
IG-IMRTdaily Tomo
73 100% 3 mm 0 0%
1. Geretschläger A et al. Radiat Oncol.2012;7:1752. Yao M et al. Int J Radiat Oncol Biol Phys.2007;67:13323 Chan AK et al. Oral Oncol. 2013;49:2554. Chen AM et al. Int J Radiat Oncol Biol Phys. 2011;80:1423
5. Chen AM et al. Head Neck. 2010;32:14526. Daly ME et al. Int J Radiat Oncol Biol Phys. 2011;80:14127. Ooishi M et al. Jpn J Clin Oncol. 2016;46:9198. Hsieh CH et al, BMC Cancer. 2016; 16:1399. Chen AM et al. Head Neck. 2014;36:1766
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Far Eastern Memorial Hospital, Taiwan
Margin for primary PTV IMRT: 5 mm HT: 3 mm
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CTVPTV = CTV + margin
GTV
Setup Error of Postop oral cancer by Tomo MVCTVariation
X-axis (right and left) 6.4 – 8.7 mmY-axis (craniocaudal) 4.7 – 9.7 mm
Hsieh CH et al, BMC Cancer. 2016; 16:139
But
Bigger PTV of IMRT vs. Tomo
Far Eastern Memorial Hospital, Taiwan
Geometric miss: observed setup error with axial component greater than the margin size
Yu Y. et al. Head Neck, 2014
Different IGRT protocol and margin size
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Less-than-daily image-guided RT strategies: UCSF high incidence of potential miss at 3-mm PTV margin Recommend: at least 5-mm PTV margin
Far Eastern Memorial Hospital, Taiwan
Geometric miss detected by TomoTherapy®-MVCT
Be careful : Weight loss/gain, tumor shrinkage/progression, edema !
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Far Eastern Memorial Hospital, Taiwan
Increases CI & UI
Decreasetoxicity
Improve accuracyOff-line adapative plan
TomoTherapy® System vs. IMRT
Retrospective survey
Daily IGRT using TomoTherapy® System may increase OS and local control rate !